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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf5c52e8d3c0b3d0572a6c8911d32d08e10406e9be54b5f5ed4af9ffcdf64e7' 
  AND token = 'hMbnoshSfMw1ocza2evTd4AX0xZ5OXnN4AXpR3rzdhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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