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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01b59c40746a4dac93f70e2b8a02805157d47afbe29bc2ad5d9e100cfba8e48' 
  AND token = 'cEsI3DijHXFEMVBJ2bNJA0MGurLKZJ9XQVexByVs5fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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