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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4efab062841da676bdb73e932c657d71a88c66fcc680ca0cd6b13a05842aabd' 
  AND token = 'huL73h0pH9bBaOFlJUqa4Kpe0lMHS/0lBH0xt+YXL/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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