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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845533a0d6f7527dc7bafb58e08dc72f38493d415869a5ad79dc04f5995dab8a' 
  AND token = 'rMxe4dKkmGQDd4c+C65pX+fBEtfF1Nu7V+q0mVzDxdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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