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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c133e4897651e226de9be942d4306c453e31a84c78f94b190a4ca02b47673572' 
  AND token = 'vlwGxRuSpDFp81tqCGmuvxpyBo9O2X3RMOT60Mi54dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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