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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09271704ccfc3374a19f5b5827b3ea49ae83958d5dc5e7ee4288c0073dc4b02' 
  AND token = 'mRraXjDcKnNP36PKYF1DyZlGubyzujVAuxFx3eWmoWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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