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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f877b52ff26c5f35bb8223c88e39f5e29b6ff639efa3b87761494e3de2108c00' 
  AND token = 'ZiMUXX3+7E2JFN9jH/UX/TKrVjQE8+tq7afZSU/hYQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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