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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cd5f9bb42874cdfd2d8d71b5a614df7d1ae0d723e47e05e02278e182da36be' 
  AND token = 'wiMOo+/5vVJQ/j71a418/VGrMitEOr626FBkW3Mt16Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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