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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa41530b5e8c5a2c07ea7b3e7e91c90c89599b10694dfd5ed002e0657b104de' 
  AND token = 'qwDWJc4mwSokNoh2X3xTavUcRnqEEs/S5hwxzznNrHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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