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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7cca64dbbcebec0d2386804b609dae2dd33fccb8933f72b5e6c53eac15642f' 
  AND token = 'lL2PE64ZKSGmmHJlakQAU1V6N/rk8DOoCYq5XKpqBDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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