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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c90ff4c7a79604e2d8ad2019737d7e3122eb8fc45d5dd29afc9007fb7d98d4' 
  AND token = 'hacJNVl6FnsN3CmsmN4NL5MPlh948nnMuOv1nJUpFCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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