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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e987fb2bc58f6ed3fc086c99421779dc7afd1c2dc5dd7a1d26afd350cfdd5331' 
  AND token = 'hHFcg3Wk2FFL7tfmOUYcWhq8y0ZUf0zXfdfZOVSyI7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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