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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2192835bd2d7e5d95cdd4ad8fe61030c1c0b3caf3591ec671ed2792794750a3a' 
  AND token = 'vHRXR2ePeoEpsa81a8T1vZYaqRhxIO4eDwzdjycG6wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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