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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1b7554b29919e052c21e3ff3dd813be767403abd5230015800de33e4bb0e2a' 
  AND token = 'hSvExU7o1w87ar7Q4nZ3e9dxfr0x8/LzGN2WZEr/hyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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