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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cda7197668f2e13519e132618e0ea5280dc8ab0739f5c277e3c99efcbd55a97' 
  AND token = 'GDCmRohDug60CzZBXYnEfIZJTPV9oqxBAx2Sf1orBLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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