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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8485d6989d17a7c0ded5c32f75fe5b235a9837d3b7b9bf61e2faff740447a690' 
  AND token = 'Ymoo6EAlBceXfFI/t8QHAebb9G1SJd7rtTUV2M2Q6FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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