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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2e097d0d36eb044c545fc457b3f77ff9c876c3d400263b8e3f0b5f5331d608' 
  AND token = '7sg0LkI4JVoWIOpO4FMnYfrjUdo6TyLBcPj+wOsb92g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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