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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fc03b14bf551d9ffb38ae66da082e0576f745da82a2156f69959fd604550ef' 
  AND token = 'lio1z4ZQzjS1cyj5r8m6rK9vy7cg6OnJ7BaxyY/m8k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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