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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b50da7244e6b316abc31fcd646c958ee847e2a323a269f13578d3bbc89ba85' 
  AND token = '+1QoMpIk6XOJCFe4lgpvksf3CA4v00Mjl8+sjGS4rB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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