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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9649a961ccc243726dd8a1e754dbc66618d17baedf3b3a487e83cef55a9378a0' 
  AND token = 'NMuXeEqbR3T1dyxXf2///MsmgANX+MyXmayWYIOfyYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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