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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa169754e0e0f2b605fa0d4e5e7eff0abc4999b6c5bcbfde65285326f5813f90' 
  AND token = 'ZPckGVEzLIi+542E46Gh87GHsY/UKDOgoAjAe8NXN9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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