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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d712cb8b51a7111c9ca177c7f32e984a4f39348a8421dcf825686d0e54490a' 
  AND token = 'v723kJsdqfmzPX4JDhW4FZtHN8hqNiV4BNAdxiS/804=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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