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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e4d63e11852d6a15211407fdf340f98bde55e6521b1f9827e2a9449a236a52' 
  AND token = 'QymjEXlrMlBYC9765yZMyPU1+idadO0FSP1sU7Lxu4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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