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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1861329f0ff4335505001c254ee35885a2d1c9c328bc27feb933932b984c01' 
  AND token = 'KAcxDpRzQyw8OWmJSWNLoSN8NKMZeci9cyILmiu2xEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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