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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9481c5948cb309c323d0763d453e5d7d7a2697eb4d08b89bc0b194b20decd9' 
  AND token = 'MJJ5j4o/+TGTVgdJPJ+p42Q17OCWaCOBeYVWVtpHFTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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