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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4e3e2b49873094f9bccb8c191ca055d790f40c34221399632bf34a1e585cb2' 
  AND token = 'dAkHJOfQ4SRmKxz8PsXTCLX2vX3svOnkhIJbgaRwJf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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