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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '006854b87df5b50554efd203bdb8c2ef7ae6af473c41ff9f26107eac82b2e668' 
  AND token = 'SG6p6Iz1tkgO9eKIn7Zh8+ToPiCktfnqj2SYesbCRGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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