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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9af9ce6667a3b8f39133df2faf996ee990f036d1d37527c9f5d9feb9309683b' 
  AND token = 'Wzb307F6G2XqX4b8XmJkiUMBX4ekSz01FmacyEMnl5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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