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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e90e890662e4fe7e47e6adbee1cad317c5aa6adfeb66aeff97198f295569fd5' 
  AND token = '0UVH0wI2SQ6JdOpDXzHUkoIrGSU6nq30dmOu/aFoP2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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