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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3f82b938878c4fb8a56c5689a78f3a930c184e9ebcd39b259dff6f79e889a6' 
  AND token = 'FseO2YIHbvHxCiN3jkyhBKceBVPsW1eAIBhOggSVDPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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