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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c342b2ff2b10a4f83df4d23ffb43df393e0100c28f84a5c4b76b366682f523' 
  AND token = '6qHNpnsGh+NO+U4jFBXR/VH4aXvgcObhLr9WgCV2Cpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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