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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b09e47bbfcc3b718e3c86ad1f0f91b883a565b9174d1ca0e3dcfbc146b0d149' 
  AND token = 'TfqXafB7bIuJ2fW/sdJCK47IuOo7bEjp+VDpRFz8who=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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