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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcce739782c6c3b2fb54486693918989e18e3482ed5ad5e1310da3e97f81ed7' 
  AND token = '1LmYay0zP9eIWGLo/cO/yh2bAkPnERES9WTuf+cpQXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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