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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd367dd52ab7d1f21148cab1d65bd76eef867d1eb7a3d2051e14479b5d5ba20aa' 
  AND token = 'ZuQmOqcJ0L+BpHhdrFK5mJdCULiTLQVri0pykid3T/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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