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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054022e2ae0510395efa7b774783b2fc4ac056cdd52875436332424d687bc4ad' 
  AND token = 'PURX/Vz4WUymfZwc8Mly9M/hsEO9RLdh2W4OErnpokE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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