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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cc6ef894ad211b99c01ecb71088e761b2d8b98814f6ef7f74cbd639a8930f7' 
  AND token = 'QPRqOPzVRSMWiIMSzOrMrcYFlRbxPCHy0S1z9QPChrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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