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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26a02ca7bda204de9f4d5929b1dd6ee47abe0e4a958b3d38d2ab20e9a11b07b' 
  AND token = 'ZvQTrSJ2gkoK9Af8ZSfAAfDh4dO48k+DWJq9M4IbStg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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