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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64c0fd409c34b2bb59d840cb0003d569210b43b6eb6fa9d2228810312b0f5a5' 
  AND token = 'D+xvUegCV/30HXgLXiBCQpfqc6kBg7HRGDeilSZFNX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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