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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097f2a46a88b12a30649bb2e98ccb6c5891d6e15bd3cda0ffc445aa8168f7e3e' 
  AND token = 'd9xlbpH/LqUgmdCdsXfpD4fF2gVxw7G5f24VLsH0Nz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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