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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47df171bd67c6e110c5b2d0cd55d3959fd2e29d46c5a8f5fd9876a3c778a3f3a' 
  AND token = 'A0ukPW9onWzJ0154W3sz7Vkhpvd7ecstrKsEtDgcSBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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