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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8b3f9f63115f8280133aab63d51930d7b167d957995dc78ffa06f0a9927a3a' 
  AND token = 'vFtFElQRPhTC0gVvuHxB/DNKtuR06BxPw/gHsapPAOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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