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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4bf1b3362b03a18303abda275e9931a2579be628e4b05a70d3ff1188a1e31d' 
  AND token = 'Gn4RxA0agd1OrRGA9cnQR51KSf9tUhF+cFN9lyaN2Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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