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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a98a33a43dfb901989edb417b18c5aa96db16149ab5994fc7b7e72bdc82a0a' 
  AND token = 'qoFsQq/4vP2VA1kTkMK+FIjaHEUk4awT3oJdi8cEZIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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