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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52377af909fd4b79eacc2a5d2a0512470b761c340575ae3a463bc074607962aa' 
  AND token = 'r1BbC4IBuLQoR6AX45kMDCVNlP123RIP5InOoYjLmOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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