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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c213db9aaccc8bb92e5c741bc9f41eee2a2d0a3557ae0f7b468770e43ce19bc8' 
  AND token = 'JWthmb8vPG1rTva9zTiR11UtBfPB5s5mrABRVLHqssI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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