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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c77ab3bfade664f5816679c505f8ee2e96a834bf5db3ba56fe30012a38f3f22' 
  AND token = '61fxncSugjhPKJP6t6t+2hrwvC7XjFRC6R9LP6cdMVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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