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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c700b502084112d2f3aaa8167e29b5e8f5a01b1488b50cbec7ccc27dc1a06c' 
  AND token = 'MRHr/+9GaRltQfOAoyjxjtNrp3GSHN9kvsF9S8/Er1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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