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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c750e9206e2fd4ba4cf0164f1e62fa13a576e76bd897c3536a459e80d03233bb' 
  AND token = 'qxmHWMaYOcR4M9GM8ARryFRwVN2uIe803fEGycwVwLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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