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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88e5e527c78dec2ba795992765d917d1e090c2e00e04094427e3da6efd991b4' 
  AND token = 'C0u8ft8lb28k6TK4cgyuCGKEYpVgVO1Y0S8FGBmzncc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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