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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f32a5f5c0c0b6860562cf8edf3149a926e2c8dacc952a1aa53b0f601ff0771' 
  AND token = '7K68jQM0VYo+0MTzNbbCv0e6RGwXhCFox0IdlKtYEJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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