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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9511b591cf01174e18778889aa5bf1493a1c2debd9412978ad628e84a22214f0' 
  AND token = '7Dt+FInDCXUqRsstiZAHluhvxbF2lIWoeVHQxyKHYvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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