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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93839cd716d5e0c29a2469397b7567b39b6c43e66cdb7bf8177b657118f2d8a8' 
  AND token = 'w1PjVrT0b4vx+ppJfXpEgmM2ipZ8IfWnMKW4/Kb812w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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