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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dfa09e3de5b6242fb5e9fedb9b58a5a2ddc38fcfb1352043f1375b0bc56334' 
  AND token = 'Jz5vDz8UjLzAWI/63WhgryxGaf+43bM6MQA3tZpA6y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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