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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ec5831ad33573cb2321bda8f68b26a5af1b869fd855378435a989d47e9fffa' 
  AND token = 'ffcriv0ir0embxHL6ba2P3nN+lnE4CMh4LdecCOC2yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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