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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81fd56bafa4c91ae9017ce6fc3c493213c982c70fd74340fecc798b706b3f726' 
  AND token = 'fiAtO1LpRHV7mfpDxjj1kP3Y3r8F/1giDGQX9TahstY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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