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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c0a67aa31cec6698bfb8a1c985f1bc0c7b0cb83e248dc5c927de0bc8891776' 
  AND token = 'ITiXndWL2ocJ6gam5JMrcdTeH+QYPL2n3j3+5RY62dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}