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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e69725301d5d34c3791719132087a3c48d91c324fcf7824de5db56ee5de76b' 
  AND token = 'idhwPs5yUnrR8xgRoCXvzUReUVEL9Nj7Z3yuflZkgNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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