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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a3632a815deeac046a0bd8ca1040cc99ee9710171bbc321f3402f86f74a6a5' 
  AND token = 'ysvdE8kBvIuy0Yr/NJCruRE+hLo/vwrXBfEr+JbeUUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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